Greetings all...let it be known that I have no idea how to do pneumatics at all...but I want to lol...I've heard that I can use a screen door thing to make a cylinder....how much force can that thing actually do and how reliable is it?

heck is a cylinder even what i need...what im trying to build is a prop thats prone and hidden but when the crowd approaches the plexiglass it pops up and out smacking into the "glass" ....what kind of mechanic would i want for that?